[Formula Presented]-dibaryon and hypernucleus formation in the [Formula Presented] reaction at rest

J. K. Ahn, S. Aoki, K. S. Chung, M. S. Chung, H. En’yo, T. Fukuda, H. Funahashi, Y. Goto, A. Higashi, M. Ieiri, T. Iijima, M. Iinuma, K. Imai, Y. Itow, J. M. Lee, S. Makino, A. Masaike, Y. Matsuda, Y. Matsuyama, S. MiharaC. Nagoshi, I. Nomura, I. S. Park, N. Saito, M. Sekimoto, Y. M. Shin, K. S. Sim, R. Susukita, R. Takashima, F. Takeutchi, P. Tlustý, S. Weibe, S. Yokkaichi, K. Yoshida, M. Yoshida, T. Yoshida, S. Yamashita

研究成果: ジャーナルへの寄稿学術誌査読


Stopped-[Formula Presented] reactions have been investigated with respect to H-dibaryon and hypernucleus formation with a scintillating fiber detector. Out of [Formula Presented] tagged [Formula Presented] particles via the [Formula Presented] reaction we obtained 72 stopping [Formula Presented] events with [Formula Presented] background events after imposing kinematic constraints. Hypernuclear production has been studied by observing free Λ decays in the stopped-[Formula Presented] reactions. From the observed Λ momentum spectrum, we have found the hypernuclear production rates to be [Formula Presented] and [Formula Presented] for double/twin-Λ hypernucleus, single-Λ hypernucleus, and no hypernucleus cases, respectively. With the same sample, we set upper limits on R (stopped-[Formula Presented] stopped-[Formula Presented] all) for [Formula Presented] decaying into [Formula Presented] and [Formula Presented] for [Formula Presented] masses just below [Formula Presented] mass threshold and for [Formula Presented] lifetime range [Formula Presented] The upper limits on [Formula Presented] are [Formula Presented] assuming all of the [Formula Presented] decay into each decay mode. Our results give a tight constraint on the existence of the bound [Formula Presented] in comparison with the theoretical estimates of Aerts and Dover, albeit with different target nuclei.

ジャーナルPhysical Review C - Nuclear Physics
出版ステータス出版済み - 2000

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学


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